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2020-11-24_REVISION - C1994082
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2020-11-24_REVISION - C1994082
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Last modified
12/1/2020 10:49:19 AM
Creation date
12/1/2020 10:43:19 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Revision
Doc Date
11/24/2020
Doc Name
Adequacy Review Response
From
Peabody- Twentymile Coal, LLC
To
DRMS
Type & Sequence
SL8
Email Name
RAR
JLE
Media Type
D
Archive
No
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The mean allowable all -hit herbaceous vegetation cover sampled in 2016 BRB-3 was 48.2%, <br />exceeding 24.7%, which is 90% of the cover performance standard (see also Figure B-la, Table <br />B-1). This direct comparison of reclaimed area mean to the standard is allowed under DRMS <br />rules (CDMG 2005 revised rule, 4.15.11 (2)(a)) when sample adequacy has been demonstrated <br />for the reclaimed and reference areas. Thus for 2016, successful revegetation with respect to <br />allowable all -hit herbaceous cover is demonstrated. <br />SPECIES DIVERSITYAND COMPOSITION <br />Mandatory test A requires that no single species comprise greater than 60% relative cover in the <br />bond release area. Test results are shown in Table 1. <br />Table 1. 2016 Mandatory Test A for BRB-2a and BRB-3 Phase II Bond Release Areas. <br />Area <br />Most Abundant Single <br />Species <br />Relative Cover (%) <br />BRB-2a <br />Medica o sativa <br />15.7 <br />BRB-3 <br />Pasco rum smithii <br />17.06 <br />Hence Mandatory Test A is passed for the Phase II areas. <br />Table 2. 2016 Alternative Test B, the Total Species Density test for the Yoast BRB-2 Phase <br />II Bond Release Areas <br />Area <br />Probability -Adjusted <br />Density Standard <br />Mean Species Density <br />BRB-2a <br />20.59 <br />22.85 <br />BRB-3 <br />14.16 <br />19.29 <br />Since the Phase 11 bond release area value was greater than the standard, Alternative Test B is <br />passed. <br />Alternative Test C, the similarity index between the lifeform species density values for the <br />prescribed lifeforms for the bond release area and the Mean Species density (Area -weighted) in <br />the 5 reference areas is found in the table below. <br />SL-8 - 8 <br />
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